Question

during a classroom experiment, a burning magnesium ribbon was dropped into a glass test tube filled with oxygen. a bright white flame was produced. a white powdery substance formed at the end of the reaction.
which other element is likely to show a similar chemical reaction with oxygen as shown by magnesium, and to which group does it belong?
k, it belongs to group 2
na, it belongs to group 1
ca, it belongs to group 2
c, it belongs to group 1

Explanation:

Magnesium (\(Mg\)) is in Group 2 of the periodic table. Elements in the same group have similar chemical properties. Calcium (\(Ca\)) is also in Group 2. Potassium (\(K\)) is in Group 1. Sodium (\(Na\)) is in Group 1. Carbon (\(C\)) is in Group 14. Since we are looking for an element with similar reaction (due to similar valence - electron configuration, Group 2 elements have 2 valence electrons), calcium (\(Ca\)) in Group 2 is the answer.

Answer:

Ca, it belongs to Group 2